Salary paid in beneficiary or TC country?

Hi, I'm a GF with a UK beneficiary and Australia as TC. During my outgoing phase, I would prefer to be paid via the UK because the tax and pension regulations are better than in Australia. However, my UK institution says that this is not possible:"UK HMRC Tax Rules state that you have to be paid in the country where you are working unless there is a specific exemption in the double taxation treaty with that country. Therefore, it is not possible for an individual to choose to be paid in a particular country." This seems awkward to me, especially because I know of several cases where, with the exact same country combination, fellows are been paid in the UK throughout their outgoing phase. Would anyone be able to give me some advise on how I could push for my right to be paid in the UK? Thanks a lot! gerrit